Issue |
A&A
Volume 449, Number 2, April II 2006
|
|
---|---|---|
Page(s) | 641 - 643 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20054422 | |
Published online | 21 March 2006 |
Very high energy γ ray absorption by the galactic interstellar radiation field
Key laboratory of particle astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, PO Box 918-3, Beijing 100049, PR China
Received:
26
October
2005
Accepted:
14
December
2005
Aims.We calculate the attenuation of very high energy γ rays from Galactic sources.Methods.A recent calculation of the Galactic interstellar radiation field shows that the infra-red radiation background near the Galactic Center is very intense. The attenuation of very high energy γ rays by this radiation is strong and occurs at lower energies than previously thought.Results.Our result shows that the cutoff of the high energy γ ray spectrum begins at about 20 TeV and reaches about 10% for 50 TeV γ rays.
© ESO, 2006
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